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    • 441.6 nm Ultrasteep Raman Long-Pass Filter

    The MP-LPF-442 is a high-performance ultra-steep edge long-pass filter specifically designed for 441.6 nm laser Raman spectroscopy systems. Manufactured using high-precision ion-beam sputtering (IBS) multi-layer dielectric coating technology, it provides a blocking depth of >OD6 at the 441.6 nm laser line while maintaining an average transmittance >93% over the 447.3-996.1 nm range. This effectively suppresses Rayleigh scattering and improves both Raman signal collection efficiency and signal-to-noise ratio. Featuring an extremely low Raman cut-off shift, ultra-steep edge, high transmittance, and excellent environmental stability, this filter is widely used in research-grade Raman spectrometers, confocal Raman microscopes, and industrial in-line Raman detection systems.

    Product features：Specifically designed for 441.6 nm laser Raman systems；Rayleigh blocking depth > OD6；Ultra‑steep cut‑off edge；Raman shift cut‑off at only 112.7 cm⁻¹；Fused silica substrate – low fluorescence and low stress；High environmental stability for long‑term use

    Part Number：MP-LPF-442

    Application area：Raman spectrometers | Confocal Raman microscopes | Semiconductor material inspection | Graphene and 2D material research | Scientific

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    Main parameters
  • Core parameters

  • Laser Wavelength Transmission Band

    441.6 nm Tavg > 93 % 447.3–996.1 nm

  • Dimension Drawing
    • General Parameters

    Specification

    Value

    Laser Wavelength

    441.6 nm

    Transmission Band

    Tavg > 93 %  447.3–996.1 nm

    Blocking Band

    OD > 6  441.6 nm

    Blocking Band

    ODavg > 6  356–441.6 nm (typical)

    Edge Steepness

    0.5 %

    Edge Steepness

    112.7 cm-1

    Edge Steepness

    Ultrasteep (for Raman)

    Edge Steepness

    2.2

    Edge Wavelength

    445 nm

    Transition Width

    4.4 nm

    Transition Width

    224 cm-1

    Angle of Incidence

    0 ± 2°

    Cone Half-angle

    5°

    Clear Aperture

    22 mm

    Transverse Dimensions, Diameter

    25 mm

    Filter Thickness, Mounted

    3.5 mm

    Filter Thickness Tolerance, Mounted

    ± 0.1 mm

    Filter Thickness, Unmounted

    2.0 mm

    Filter Thickness Tolerance, Unmounted

    ± 0.1 mm

    Surface Quality (Scratch-Dig)

    60-40

    Filter Effective Index

    1.86

    Optical Damage Rating

    0.5 J/cm2 @ 266 nm (10 ns pulse width),1 J/ @ 53 cm2 2 nm (10 ns pulse width)

    Orientation

    Arrow on ring is preferred direction of propagation of light

    Substrate Type

    Fused Silica

     

    Spectral Characteristic Curves

     

    Transmittance-Wavelength Spectrum

    图片2.png 

     

     

    Optical Density Spectrum

     图片3.png


    Optional Configurations

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    Downloads

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  • Product title: 441.6 nm Ultrasteep Raman Long-Pass Filter
  • Product link: https://www.idealphotonics.com/product/detail/1653.html

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    • 10000 10k + Diodes sold worldwide
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